“What is the difference between the 43S405 and the 43S517? and...are they BOTH 120 Refresh?”
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The 43S405 is a member of our 4-Series, while the 43S517 is a member of our 5-Series. Both series include a built in Roku operating system, 4K UHD, 120hz CMI refresh rate, and HDR Support. The 5-Series goes a bit further and has additional features such as Dolby Vision and wide color gamut. Hope this helps! Thank you, TCL Customer Support
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